Bowling ball core · Storm
Storm Capacitor Core
The core inside the Storm Pitch line
A symmetric core with later rev-up, more length and low flare, built for dry to medium oil. 1 of the 5 balls with this core are in stock at BowlersMart.
- Symmetric
- RG 2.570
- Diff 0.022

Specs
RG AT 15 LB
2.570
Later rev-up, more length
92% of the reactive and urethane balls we stock have a lower RG.
DIFFERENTIAL AT 15 LB
0.022
Low flare
2% of the reactive and urethane balls we stock have a lower differential.
MASS BIAS AT 15 LB
None
Symmetric core
Symmetric cores have no mass bias marker to place when drilling.
| Weight | RG | DifferentialDiff | Mass biasMB |
|---|---|---|---|
| 16 lb | 2.560 | 0.023 | None |
| 15 lbUsed on this page | 2.570 | 0.022 | None |
| 14 lb | 2.590 | 0.022 | None |
| 13 lb | 2.610 | 0.021 | None |
| 12 lb | 2.630 | 0.021 | None |
Source: Storm published specs, as shown on BowlersMart’s original Storm Capacitor core page (2022). RG and differential change with ball weight; use the row for the weight you throw. The highlighted 15 lb row is the one used on this page.
Balls with the Storm Capacitor Core
1 of the 5 balls with the Storm Capacitor Core are in stock at BowlersMart. Same core, different covers: pick the cover for the lanes you bowl on.

Storm Controll Urethane Solid
Dry to medium oil
Show 4 balls no longer available at BowlersMart
| Ball | Cover | First seen |
|---|---|---|
| Storm Pitch Black 78/U Bowling Ball | Control 78 Solid Urethane | June 2026 |
| Storm Pitch Purple Bowling Ball | Storm Rev Controll Urethane | January 2020 |
| Storm Pitch Sky Overseas Bowling Ball | Storm Rev Controll Urethane | August 2019 |
| Storm Pitch Out Overseas Bowling Ball | Storm Controll Plus Pearl Urethane | August 2019 |
Where the Storm Capacitor sits
Each dot is a core in balls we stock. Cores close together roll alike; the cover and layout decide the rest.
Navy ring = a ball in your bag. Dashed ring = off this chart, or this same core.
Nearest cores, zoomed in
Navy ring = a ball in your bag. Dashed ring = off this chart, or this same core.
This core 1 Nearest cores Other cores
| Core | Brand | Shape | RG | Diff | vs this core |
|---|---|---|---|---|---|
|
|
Storm | Symmetric | 2.580 | 0.024 | RG +0.010 · Diff +0.002 |
|
|
Hammer | Symmetric | 2.586 | 0.027 | RG +0.016 · Diff +0.005 |
|
|
Motiv | Symmetric | 2.570 | 0.015 | RG 0.000 · Diff −0.007 |
|
|
Motiv | Symmetric | 2.550 | 0.030 | RG −0.020 · Diff +0.008 |
|
|
Brunswick | Symmetric | 2.568 | 0.032 | RG −0.002 · Diff +0.010 |
|
|
Storm | Symmetric | 2.610 | 0.020 | RG +0.040 · Diff −0.002 |
Matches use 15 lb RG and differential.
Drilling and tools
Turn on JavaScript to compare with your ball.Balls with the Storm Capacitor Core1 of the 5 balls with the Storm Capacitor Core are in stock at BowlersMart. Same core, different covers: pick the cover for the lanes you bowl on.
Questions bowlers ask
What is the RG of the Storm Capacitor Core?
At 15 lb the Storm Capacitor Core has an RG of 2.570. It ranges from 2.560 to 2.630 across the listed weights.
What is the 14 lb RG of the Storm Capacitor Core?
At 14 lb the RG is 2.590.
What is the differential of the Storm Capacitor Core?
At 15 lb the differential is 0.022. This is a symmetric core, so mass bias is not applicable.
Which bowling balls use the Storm Capacitor Core?
Storm Pitch Black Bowling Ball, Storm Pitch Black 78/U Bowling Ball, Storm Pitch Purple Bowling Ball, Storm Pitch Sky Overseas Bowling Ball, Storm Pitch Out Overseas Bowling Ball. 1 are in stock now.
How do the Storm Capacitor Core specs change by weight?
At 16 lb: RG 2.560, differential 0.023. At 12 lb: RG 2.630, differential 0.021.
How does the Storm Capacitor Core compare with my ball?
Type the ball you throw into the Compare with your ball box on this page. It shows the RG and differential side by side and saves your bag for every core page.
Sources and method
Specs. Storm published specs, as shown on BowlersMart’s original Storm Capacitor core page (2022), as published by the manufacturer.
Baseline. The baseline is 212 in-stock, published reactive and urethane balls. Plastic and polyester covers, 2-piece, 3-piece and pancake cores, missing covers and missing RG or differential values are excluded.
Percentiles. Percentiles are the share of baseline balls with a strictly lower or higher value; ties are not counted.
Nearest cores. Nearest cores are ranked by distance on standardized 15 lb RG and differential, with the same symmetric or asymmetric shape preferred among near ties (distance bands of 0.1).
Mass bias. Mass bias is compared among asymmetric balls with numeric mass bias only.
Updated. Catalog and page updated 2026-10-16.


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